Stair-tread anchor.



/N Ris H. Verify H. H. VERITY s. J. HANsoN.

v sTAm TREAD ANCHOR. APPLICATION FILED AUG.13, 1912. l I ,056,607, Patented Mar' ATTORNEYS out UNITED sTATEs PATENT orrion.

1,056,607. Specification of Letters Patent. l 'Patented M31'. 18, 1913. t Applicationled August 13,1912. SerialNo. 714,824.

similar suitable material. vThe head of each bolt D'extends in agroove C so as to be below the tread faceof the tread plate, and the nutl D ofeach bolt D abuts against` the under side of theslotted top of the block B. The front end yof each block B Ais open so as to permit of conveniently passing the bolts D in engagement with the top. slot B and to allow of holding the nuts D against turning while screwing up the bolts D to vSecurely fasten, the ltread plate C in position To Vall w/zom t may concern:

Be it known that we, HENRY H *VERITY and JOHN HANsoN, both citizens of the United States, and residents, respectively, of

' w York, Ozone Park, borough o-fQueens, i-n the countyaof Queens and State of New York, and lo f the'city of N' ew York, Corona, borough of Queens, inthe county of Queens and Statefof New York, to have invented a new and Improved Stair- Tread Anchor, of which the following is a full, clear, and exact description. The invention relates to concrete lstairways, and itsobject is to provide a new andv 15 improved stair tread anchor adapted to be embedded in the concrete steps','and ar-v ranged tov allow of conveniently and -se-v curely fastening the stair treads in -posit-ion or removing the same in case one is worn a recess B2 into which lits a closingv plate E4 70 closing the open end of the block B after. the tread plates C are fastened in place on the anchor blocks B by the use of. the bolts The closing plate E is provided with a boltF adapted to extend between lugs B3v 75 rising integrally from 'the bottom ofthe anchor block B, the lugs being spaced apart for the passage of the bolt F, and the lugs B3 being provided at the rear with a recess B4 for the reception of the nut F of the bolt 8o F, so that the nut ldoes not turn on screwing up or unscrewing the bolt F on placing the closing plateE in position on the anchor block Bor removing it therefrom.

The sides of each anchor block are beveled to prevent upward movement of a block in `the embedding concrete, and the anchor block gradually widens from the front end to the rear end thereof to prevent outward movement of an anchor block in the concrete l step A. a

From the foregoing it will be seen that byl Ythe arrangement described, the anchor blocks can be readily embedded in the concrete step A and the tread plates C can be 'securely fastened in position on the anchor blocks or removed therefrom for repairs or renewal, if deemed necessary.

In order to hold the anchor block B in place so that the same may be hsed while the surrounding concrete is still green, an anchor sleeve E .is placed inthe concrete and then the anchor bolt E? ispassed through aperture E3 and screw d into the anchor sleeve. 105

Having thus described our invention, we claim as new and desire to secureby Letters Patent:

1. A stair tread anchor, comprising a plu-- rality of spaced hollow anchor blocks eX- tending transversely on a concrete step and embedded therein, each block being provided For the purpose mentioned use is madeV ,of a plurality of spaced, hollow anchor blocks extending transversely in the concrete step and embedded therein, each block 25 being provided atthe top with a transverse slot for lthe reception of bolts to fasten the stair tread in position on the anchor blocks.

A practical embodiment of theinvention is represented i'n the accompanying draw- $0 ings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

igure 1 is a cross section of a stair tread anchor 'block as applied; Fig. 2 is a plan 35 view of the same with parts in section;v Fig.

3 is a cross section of an anchor block; ig.4 is a front end view of the same; and Fig. 5 is a reduced front view of a step provided with the improved ancho-r and 40 tread plates.

In each concrete step A of a concrete staircase are embedded a series of transversely-eXtending hollow anchor blocks B flush on top with the top of the step A, as

45 plainly indicated in Figs.l l and 5. Tread plates G, preferably two in number and eX- tending approximately/"the length of a step A, are placed on top of the several'anchor blocks B and are fastened thereto by bolts 50 D engaging a transverse slot B formed in the top of the corresponding block B.I As shown, two tread plates C yare used on eachl step A, one behind the other, and each platev is provided with longitudinally-extending 5 alternating grooves or corrugations C and tread faces @2^ of emery, carborundum or at the top with a transverse slot vfor the reception of bolts to fasten the stair .tread in position on the anchor blocks, each block being open at the front, and a removable plate closing the open front end of the block. 2. Astair tread anchor having a hollow anchor block provided at the top with a slot for the reception of bolts to fasten atread in place on t-he block, the front end of the block being open and. provided with a recess, spaced integral lugs rising from the bottom of the block at the front end, a plate tting into the saidreeessed front, and a bolt engaging the said plate andthe said lugs to removably'fasten the plate in position.

3. A stair tread anchorv having a hollowl anchor block provided at the top with a slot for the reception of bolts to fasten -a tread in lplace on the'block, the front end of the block being open and provided With a recess, spaced integral lugs rising from the bottom of the block at the front end, a plate fitting A into the said recessed front, and` a bolt-engaging the said plate and the said lugs to removably fasten the plate in position, the

said lugs being recessed at the back' for er1- l gagement with the nut of the bolt to prevent the nut 'from turning.

4. In combination with a concrete stair step a plurality of spaced hollow anchor blocks embedded in the said step, each anchor block being provided at the top with a transverse slot, a stair tread plate lon top of the said anchor blocks, bolts engaging' the said slotted top of the anchor blocks and the said tread plate to fasten the latter in place, the said tread plates being corrugated lengthwise to receive `the bolt heads in sundry of the corrugations the nuts of the bolts engaging the under side of the slotted top of the blocks, and a closing plate removably attached to the open front end of each block to close the said open end.

In testimony whereof we have signed our names t'o this specification in the presence of two subscribing Witnesses.

HENRY H. vERrrY. JOHN HANsoN.

Witnesses L. KITCHIN, PHILIP D. ROLLHAUS. 

